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2020-07 Security Bulletin: Junos OS: MX Series: Services card might restart when DNS filtering is enabled (CVE-2020-1645)

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Article ID: JSA11028 SECURITY_ADVISORIES Last Updated: 08 Jul 2020Version: 1.0
Product Affected:
This issue affects Junos OS 17.3, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4. Affected platforms: MX Series.
Problem:

When DNS filtering is enabled on Juniper Networks Junos MX Series with one of the following cards MS-PIC, MS-MIC or MS-MPC, an incoming stream of packets processed by the Multiservices PIC Management Daemon (mspmand) process, responsible for managing "URL Filtering service", may crash, causing the Services PIC to restart. While the Services PIC is restarting, all PIC services including DNS filtering service (DNS sink holing) will be bypassed until the Services PIC completes its boot process.

If the issue occurs, system core-dumps output will show a crash of mspmand process:

root@device> show system core-dumps
-rw-rw---- 1 nobody wheel 575685123 <Date> /var/tmp/pics/mspmand.core.<*>.gz
 

This issue affects Juniper Networks Junos OS:

17.3 versions prior to 17.3R3-S8;

18.3 versions prior to 18.3R2-S4, 18.3R3-S1;

18.4 versions prior to 18.4R2-S5, 18.4R3;

19.1 versions prior to 19.1R2-S2, 19.1R3;

19.2 versions prior to 19.2R1-S5, 19.2R2;

19.3 versions prior to 19.3R2-S3, 19.3R3;

19.4 versions prior to 19.4R1-S3, 19.4R2.

This issue does not affect Juniper Networks Junos OS releases prior to 17.3R2.

The example of the configuration stanza affected by this issue is as follows:

[services service-set <SERVICE-SET-NAME>]
user@host# set web-filter-profile <PROFILE_NAME>

used in combination with:

[services web-filter profile <PROFILE_NAME>]
user@host# set dns-filter-template <TEMPLATE_NAME>


Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2020-1645.

Solution:

The following software releases have been updated to resolve this specific issue: 18.3R2-S4, 18.3R3-S1, 18.4R2-S5, 18.4R3, 19.1R2-S2, 19.1R3, 19.2R1-S5, 19.2R2, 19.3R2-S3, 19.3R3, 19.4R1-S3, 19.4R2, 20.1R1, and all subsequent releases.

This issue is being tracked as 1474056.

 

Workaround:
There are no viable workarounds for this issue.
Implementation:
Software release Service Packages are available at http://support.juniper.net from the "Download Software" links.    
Modification History:
2020-07-08: Initial Publication.
CVSS Score:
8.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L)
Severity Level:
High
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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